The following code displays the link to the “My Account” page on WooCommerce sites. If the user is not logged in, the link will show the text “Login / Register”, otherwise it will show “My Account”.
<?php if ( is_user_logged_in() ) { ?>
<a href="<?php echo get_permalink( get_option('woocommerce_myaccount_page_id') ); ?>" title="<?php _e('My Account','woothemes'); ?>"><?php _e('My Account','woothemes'); ?></a>
<?php }
else { ?>
<a href="<?php echo get_permalink( get_option('woocommerce_myaccount_page_id') ); ?>" title="<?php _e('Login / Register','woothemes'); ?>"><?php _e('Login / Register','woothemes'); ?></a>
<?php } ?>More information about the My Account page in the post Customizing the My Account page in WooCommerce.